2 Corinthians 6:4 But in all things approving ourselves as the ministers of God, in much patience, in afflictions, in necessities, in distresses,

In all things let us behave ourselves as the ministers of God – The idea is, that Paul and his fellow-labourers endeavoured to live as became the ministers of God, and so as to commend the ministry to the confidence and affection of men. They endeavoured to live as was appropriate to those who were the ministers of God, and so that the world would be disposed to do honour to the ministry. [Tindal]

The work of the ministry in the life of the Apostle Paul entails much suffering. He has to be in much patience, a spiritual fruit, borne out of the trials of the ministry that was a visible manifestation of God’s work in his life. His walk with God enabled him to fulfil the call of God to the ministry.